Q:

What does an ignition coil do?

A:

An ignition coil is a coil in a car's ignition system that carries the 6 or 12 volts from the battery to the many volts used to spark the spark plugs in the ignition. An ignition coil is also called a spark coil, and is classified as an induction coil. All induction coils are electronic transformers that transform low-voltage pulses from the DC supply into higher voltage currents needed to spark machine engines.

An induction coil is made from two insulated copper wires, called the primary and secondary winding, wrapped around an iron core. A magnetic field occurs when the electric current passes through the primary winding, and the energy is transferred to the secondary by way of the iron core. This has to happen repeatedly so that the coil is able to power the output terminals, so an interrupter bar is placed between the coil and iron core to open and close the electronic current flow. In order to make sure the ignition coil is working, one can safely remove a spark plug and place the threaded end of the spark plug to an exposed metallic piece of engine. The car should be cranked while the plug is held to the engine. A large spark appearing signifies properly functioning ignition coils.


Is this answer helpful?

Similar Questions

  • Q:

    How is an ignition coil tested?

    A:

    Although there are a number of suggested tests for the ignition coil while it is still attached to a car, the only accurate way of testing a coil is on a bench using a multimeter in the resistance setting. The ignition coil has two coils of wires, called windings. The meter quickly displays if either winding is bad.

    Full Answer >
  • Q:

    What are the signs of a failing ignition coil?

    A:

    The signs of a failing ignition coil include backfiring, starting issues, lowering gas efficiency, engine misfiring, vehicle stalling and worn out spark plugs. The most common symptom of a faulty ignition coil is when the car runs for a while and the engine dies abruptly. This happens when the ignition coil or module becomes too hot.

    Full Answer >
  • Q:

    What is the cause of ignition coil failures?

    A:

    Ignition coil failures are caused by worn out spark plugs that fail to transmit electronic signals in a functional and fluid manner. This creates a disruption in the regular flow of power across the ignition coil and makes the engine lose power. It is less common but still possible that the rotor the ignition coil rests on breaks and reduces the function of the power circuit.

    Full Answer >
  • Q:

    How can you tell if the ignition coil is bad in a Pontiac Grand Am?

    A:

    Common signs of a failing ignition coil for a Pontiac Grand Am or other vehicle include hard starting, engine misfiring, noisy engine, stalling, backfiring and poor fuel economy. The ignition coil is an integral component of a vehicle's ignition system and responsible for supplying current to spark plugs to ignite the fuel inside the engine's combustion chamber. Malfunctioning ignition coils fail to generate sufficient voltage to fire spark plugs properly.

    Full Answer >

Explore